Air-controlled lock for sliding doors.



W. J. MARTIN.

A1B GONTROLLBD LOCK PoR SLIDING DooRs.

APPLICATION FILED JULY 17,1908.

91 3,834. Patented Mar. 2, 1909. v s SHEETS-SHEET 1.

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W. J. MARTIN. AIR coNTRoLLBD 1.00K PoR SLIDING DOORS.

APPLICATION FILED JULY 17,1908.

w3. \m am Mm f ds W. J. MARTN. AIB. CONTROLLED LOCK FOB. SLIDING DOORS.APPLmATIoN FILED JULY 11,1903.

913,834. n Patented Mar. 2, 1909.

3 SHEETS-SHEET 3.

Wsw: T Jkrmj/a/non l One of the webs of the plunger has hook lock-arms Mprojecting therefrom which enter the space between the anges F and italso has a series of teeth N on said web between said lock-arms. Securedto the-sliding-doors are hook lock-arms O which are normally engaged bythe lock-arms M of the lunger, the lock-arms on the door and the ookarms on said plunger being oppositel-y disposed so that they interlock.

Normally resting on the u per wall ol the air-cliamber H is a piston Phaving an axial tube It secured thereto which is guided in a cross-bar Sin the cylinder and surrounding said tube with one end bearing againstsaid cross-bar, and its other end bearing against the piston is acoil-spring T. The stem i2 of the valve I extends up through the tubeof,

trip-arm moves away from said detent-pawl and allows the same togravitate and swing into engagement with one of the series of teeth.

The normal position of the parts is shown in Fig 4 with the door closedand the lockarms of the lockinglunger interlocked with the lock-arms ont e door, thus securely locking said door. In order to open the door,compressed-air is introduced into the annular air-chamber II, passingfrom said chamber into the valve-chamber G. The air within thevalve-chamber acts against the piston P, causing it to rise and the tubeR thereof to strike the lower end of the plunger, which latter isthereby elevated against the action of the spring L and causes thelockarms M of the plunger to be disengaged from the lockearnis O on thedoor, thus allowing the latter to be o ened. The plunger is heldelevated by the etent-pawl U which swings into locking engagement withone of the series of teeth N on the plunger when the trip arm V on thedoor is moved away from it. When the plunger is being elevated, itcarries the valve I with it and the latter cuts o the admission of airto the cylinder. When the plunger is elevated to its full extent, theoutlet-port g1 is uncovered and allows the escape of air from thecylinder, pro` vided the valve in the outlet-pipe h1 is opened, whichmay be done after the door is drawn awa from the luiiger and thedetent-pawl as engagedP the teeth of said plunger. The plunger remainselevated until the air has escaped from the cylinder and the door closed,to cause the detent-pawl to be released from the teeth of the plunger,after which the latter is forced downward into normal positionby gravityand by the action of the coil-spring L.

Having thusdescribed my invention7 what I claim is,-

1. In a locking-device for doors, the coin- Abination with a structurehaving a dooropening and a door for closing said opening, of a singlecylinder serving as a door-janib, a plunger within said cylinderprovided with a locking-element adapted to engage said door, and a valvealso in said cylinder governing the admission of the poi-ver-agentthereto and the escape of the poivereagent therefrom.

2. In a locking-device for doors, the coinbination with a structurehaving a dooropenino and a door for closing said opening, of a cy inderhaving a door-receiving groove in communication with its interior, aplunger iii` said cylinder having a locking-element eX- tending intosaid door-receiving groove and normally in locking engagement with saiddoor, air-controlled means for actuating said plunger to cause thelocking-element thereof to be disengaged from said door, and means toreturn said plunger to normal `iosition.

3. il locking-device for doors comprising a cylinder closed at its ends,a locking; plunger vertically movable within said cylinder, auwer-actuated piston within said cylinder eneatli said plunger, and aspring above said lunger.

4. A loc ring-device for doors comprising a cylinder closed at its endsand provided with a longitudinal slot, a plunger vertically movable insaid cylinder having means for locking into a door, a piston beneathsaid plunger serving to elevate the same, a sprung.

above said plunger serving to lower the same, a valve-chamber beneathsaid piston and having an air-mlet and an air-outlet, and a valve foropening and closing said inlet andl outlet actuated by said plunger.

5. In a locking-device for doors, the combination with a structurehavinfy a dooropening and a door for closing saiil o ening, of acylinder -forming the door-jam, and having a valvecliamber lariangedcentrally in its lower end and provided with an airinlet and anair-outlet, a valve Within said chamber having an axial valve-stein, aplunger within the cylinder having means tor locking said door andhaving said valveste'ni connected therewith, and a piston in saidcylinder between said pliinger and said valve through which saidvalve-stem 4eX- tends.

6. In a locking-device for doors, the coinbination with a structurehaving a door-Opern ing and a door for closing said openingof a cylinderforming the door-jamb Aand aving a valve-chamber arranged centrally inits yids IIS

izo

lower endgand provided with an air-inlet and aan air-outlet, a valveWithin said chamber having an axial valve-stein, a plunger within thecylinder having means for locking said door and having said valve-steinconnected therewith, and a coil-spring acting against .the upper end ofsaid plunger.

n a locking-device for sliding-doors,

the combination with a structure having a door-opening and a door forclosing said opening provided with hook-lock arms, ol a cylinder formingthe door-jainb, a reciproeating plunger within said cylinder and havinghook lock-arms for interlocking engagement with the lock-arms of saiddoor, aircontrolled nieans`for elevating said plunger, and means forholding said plunger elevated. 8. In a locking-device for sliding-doors,the combination with a structure having a door-opening and a door forclosing said opening, of a cylinder forming the door-jamh,

'a reciprocating plunger within said cylinder having a series of teethand means for locking sald door when closed, power-controlled means forelevating said plunger', and a weighted detent-pawl adapted to engageone of said teeth when Said door is open and to be disengaged therefromwhen said door is closed.

9. In a locking-deviee for sliding-doors, the combination with astructure having a door-opening and a door for closing said opening, ofa cylinder forming the door-jainb and having a longitudinal slot, areciprornting plunger within said cylinder having a l l l l l i i ilock-arm extending through the slot of said cylinder and adapted forlocking engagement with said ries of teeth, power-controlled means forelevating said plunger', a s ring bearing against the upper end of saidp Unger, and a detentpawl engaging the teeth of said plunger' when thelatter is elevated.

10. ln a locking-device for sliding-doors, the combination with adoor-opening and a door for closing said opening, of a cylinder formingthe door-ja1nb, a i'eciprocating-element within said cylinder adaptedl'or locking-engagmnent with said door, air-rontrolled means l'oractuating said reripn)eating-element so as to nieve the same intoposition for unlocking said door, and means l'or holding saidreciprocatingeelelnent in said last-mentioned position.

l l. A locking-device l'or doors comprising a vertically-rlisposedcylinder, a reciprocating locking p unger within said cylinder adaptedto canse the door to be locked or unlocked, a power-actuated piston alsowithin said cylinder beneath said plunger t0 elevate the latter, andmeans to lower said plunger.

.In testimony whereof, I have al'ixed my signature in the presence oftwo subscribing witnesses.

WILLIAM J. MARTIN. lVitnesses: i

ELLA C. PLUECKHAUN llAnni D. RAPP.

structure' having a door and having also avertieal se-

